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.\" Common Development and Distribution License ("CDDL"), version 1.0.
.\" You may only use this file in accordance with the terms of version
.\" 1.0 of the CDDL.
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.\" Copyright 2015 Joyent, Inc.
.\"
.Dd May 11, 2016
.Dt PADDR_TO_LOADOBJ 3PROC
.Os
.Sh NAME
.Nm Paddr_to_loadobj ,
.Nm Plmid_to_loadobj ,
.Nm Pname_to_loadobj
.Nd lookup loaded object information
.Sh LIBRARY
.Lb libproc
.Sh SYNOPSIS
.In libproc.h
.Ft "const rd_loadobj_t *"
.Fo Paddr_to_loadobj
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fc
.Ft "const rd_loadobj_t *"
.Fo Plmid_to_loadobj
.Fa "struct ps_prochandle *P"
.Fa "Lmid_t lmid"
.Fa "const char *name"
.Fc
.Ft "const rd_loadobj_t *"
.Fo Pname_to_loadobj
.Fa "struct ps_prochandle *P"
.Fa "const char *name"
.Fc
.Sh DESCRIPTION
The
.Fn Paddr_to_loadobj ,
.Fn Plmid_to_loadobj ,
and
.Fn Pname_to_loadobj
functions lookup loaded object information from the process handle
.Fa P .
This information is provided by the run-time link-editor,
.Xr ld.so.1 1 ,
and provides information about the loaded object such as the link-map
identifier, the TLS module ID, and the address of various sections.
.Pp
The pointer to the data returned by the library will only be valid for
as long as the handle
.Fa P
is valid.
Any calls to
.Xr Prelease 3PROC
will invalidate the data.
.Pp
The
.Fn Paddr_to_loadobj
function attempts to find the loaded object information, if any, that exists for
the address
.Fa addr .
Not all address correspond to memory regions that were loaded by the
run-time link-editor.
For example, if a user creates a region of anonymous memory through the
.Xr mmap 2
function, then it will not have any corresponding loaded module.
.Pp
The
.Fn Pname_to_loadobj
function looks up the object named
.Fa name
and returns the corresponding loaded object information.
Two special values may be used for name.
The macro
.Dv PR_OBJ_EXEC
refers to the executable object itself and the macro
.Dv PR_OBJ_LDSO refers to the object ld.so.1 .
.Pp
The
.Fn Plmid_to_loadobj
function is similar to
.Fn Pname_to_loadobj .
It allows the use of a link-map identifier,
.Fa lmid ,
which constricts the search of the object named with
.Fa name
to that link-map.
The special value of
.Dv PR_LMID_EVERY
may be passed to indicate that every link-map should be searched, which
is equivalent in behavior to the
.Fn Pname_to_loadobj
function.
.Sh RETURN VALUES
Upon successful completion, the
.Fn Paddr_to_loadobj ,
.Fn Plmid_to_loadobj ,
and
.Fn Pname_to_loadobj
functions return a pointer to the corresponding loadable object
information.
Otherwise, if none exists then
.Dv NULL
is returned.
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr libproc 3LIB ,
.Xr librtld_db 3LIB ,
.Xr Prelease 3PROC
